[ic] Newbie Question

Hi All,
Please pardon me if my questions are too beginner for most here. I am still
fubbing my way around Interchange and it's a very steep learning curve from
Javascript.
Is there a list somewhere of the tags that Interchange has as presets?
I want to add a required field for "policies" to my check out page. This
would be simple with Javascript because all I would need to do would be to
update the form and update the script.
The problem is that our copy of Interchange resides on a server that we do
not have direct access to and need to pay our host $60 a hour to do any work
on. As such asking them to go in and adjust the script for such a little
item is ridiculous.
I was able to bipass this before by using "gift_item" as the preset tag for
a comments box and I am hoping that something exists already for "policies"
as well.
Please let me know if this question does not make sense.
Thank you.
Melisa